lesson 4: equations of lines. slope and y-intercept two ordered-pairs (one is y-intercept) two...
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Chapter 3: Parallel and Perpendicular Lines
Lesson 4: Equations of Lines
Slope-intercept form : y = mx + b
Slope and y-intercept
Two ordered-pairs (one is y-intercept)
Two ordered-pairs (neither is y-intercept)
m = -4y-intercept = 7
(4, 1) (0, -2) (3, 3) (2, 0)
Point-slope form:
Slope and one ordered-pair Two ordered-pairs
m = (7, 2) (8, -2) (-3, -1)
)( 11 xxmyy
3
1
* This should be your bottom row on the foldable
ExampleWrite an equation in slope-intercept form of the line with slope of 6 and y-intercept of –3.
ExampleWrite the equation in slope-intercept form and then
Write an equation in point-slope form of the line
whose slope is that contains (–10, 8). Then
graph the line.
ExampleWrite an equation in slope-intercept form for a line containing (4, 9) and (–2, 0).
Example - On the back:
Parallel
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